In the really old days all we had was the bucket on the top of the door trick. And machines that reduced your swollen glands etc.
In the just old days, all we had were 'jacob's ladders' (click-clacks - originally from Japan) and domino lines - here's a really long one. (Turn your sound off)
|A Rude Goldberg contraption|
LEGO is a great raw material:
But my favourites are these ones below, perhaps because they are so beautiful and only seem to be made of wire and wood. Oh, there is a bit of clear perspex there too.